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Gold Science and Technology >

2024 , Vol. 32 >Issue 4: 640 - 653

DOI: https://doi.org/10.11872/j.issn.1005-2518.2024.04.097

Mining Technology and Mine Management

Study on the Movement Law of Overlying Strata in Underground Mining with Nonlinear Elastic Foundation Beam

  • Xiangrui HE , 1 ,
  • Xianyang QIU , 1 ,
  • Xiuzhi SHI 1 ,
  • Xiaoyuan LI 1, 2 ,
  • Wei ZHI 2 ,
  • Jun LIU 2 ,
  • Yuanlai WANG 2
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  • 1. School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China
  • 2. Guangxi Zhongjin Lingnan Mining Co. , Ltd. , Laibin 546100, Guangxi, China

Received date: 2024-04-08

  Revised date: 2024-05-10

  Online published: 2024-08-27

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Abstract

In the extraction of overlying orebodies in complex environments，it is imperative to prioritize safety and efficiency while preserving the stability of rock strata to prevent surface collapse and safeguard structures.To accomplish these objectives，it is essential to develop effective strategies for managing rock strata movement by comprehensively assessing the impact of underground backfill mining.An initial study was conducted on the impact of various mining field structural parameters，including roof thickness，original rock stress，and backfill ratio，on overlying rock movement at the Panlong lead-zinc mine.This analysis utilized a nonlinear elastic foundation beam mechanical model.Subsequent numerical simulations were performed to determine overlying rock movement values under varying backfill ratios.The results were compared to those obtained from the mechanical model，revealing differences ranging from 3% to 9%，thus validating the reliability of the mechanical model’s results.A ground mine backfill mining technology for controlling settlement of overlying rock was proposed and implemented in industrial experiments.Research findings suggest that the primary factors influencing overlying rock movement，in order of significance，are the backfill ratio，structural parameters of the mining field，roof thickness，and original rock stress.Increasing the backfill ratio is crucial for managing overlying rock displacement，while adjusting anchor support spacing and backfill ratio according to the mining field structure are effective methods for controlling overlying rock displacement.

Key words： nonlinear elastic foundation beam; numerical simulation; strata movement control; backfill mining; overlying rock movement patterns; movement monitoring

Cite this article

Xiangrui HE , Xianyang QIU , Xiuzhi SHI , Xiaoyuan LI , Wei ZHI , Jun LIU , Yuanlai WANG . Study on the Movement Law of Overlying Strata in Underground Mining with Nonlinear Elastic Foundation Beam[J]. Gold Science and Technology, 2024 , 32(4) : 640 -653 . DOI: 10.11872/j.issn.1005-2518.2024.04.097

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科研人员在新疆东准噶尔一带发现多处找矿线索

据8月7日报道，自然资源部“深部矿产资源探测与评价创新团队”矿产探测部王召林正高级工程师负责的“新疆准噶尔东北缘成矿带北塔山—大红柳峡一带铜金钴战略性矿产调查评价”三级项目在新疆东准噶尔一带矿业权空白区新发现铜金多金属矿点8处、铬铁矿点1处、赤（磁）铁矿点1处。

新发现的找矿线索中一处铜（金）多金属矿带走向近EW向，初步控制矿带长约400 m，宽约20 m，带内见大量孔雀石、石英褐铁矿化及原生黄铜矿，快速分析仪显示新鲜面铜普遍大于5%（孔雀石化处铜大于70%），同时有金、铅、锌显示。另一处铜金多金属矿带走向280°，断续长近600 m，宽10~20 m不等，带内发现多处硅化铜铅矿体，主要为孔雀石、黄铜矿及方铅矿，目估铜品位大于5%。另外几处铜矿点经地表取样也发现块状富铜矿体，目估化学样品位铜大于5%。

目前，科研人员已经完成采样送实验室分析，并将结合地球物理资料，部署钻探工作，力争实现找矿突破，完成新一轮找矿突破战略行动暨“阿尔泰—准噶尔北缘成矿带战略性矿产调查”二级项目2024年度找矿目标。

中国地质科学院）

http://www.goldsci.ac.cn/article/2024/1005-2518/1005-2518-2024-32-4-640.shtml

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